It was named for the Blendon Lumber Company, which owned much of the land in the township at the time.

There are settlements in the unincorporated communities of Blendon, North Blendon, Borculo (which lies on the western boundary with Olive Township) and Bauer (which lies on the eastern boundary with Georgetown Township).

According to the United States Census Bureau, the township has a total area of 36.5 square miles (95 km2), all land.

As of the census[2] of 2000, there were 5,721 people, 1,743 households, and 1,492 families residing in the township.

11.0% of all households were made up of individuals, and 3.3% had someone living alone who was 65 years of age or older.